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CLAR, Patent No. 619246
[2]
HALLER, 1905, COMPT REND, V141, P857
[3]
SCHEYER H, Patent No. 591496
[4]
SCHEYER H, Patent No. 597325
[5]
SCHOLLER A, THESIS
[6]
127033
[7]
430558
[8]
128121
[9]
128112
[10]
127266